Campmore.com sells cooktops.
I have a propane cooktop from them that is great if you like propane?
We plan on cooking on a campfire 90% of the time so no oven, only Dutch oven and coal style and my 15-16yr old boys have some meals (breakfast and supper) down patt. I only care about a cooktop in the house/bus to make perculater coffee before the fire is going? Of course I could hook up the electric one but if I ain't at home I am having real food and real coffee? Propane works inside. Just provide an exhaust fan when cooking and a carbon monoxide sensor at all times(just like a fire alarm).